// 1.爬楼梯 70
var climbStairs = function (n) {
    const dp = [];
    dp[0] = 1;
    dp[1] = 1;
    for (let i = 2; i <= n; i++) {
        dp[i] = dp[i - 1] + dp[i - 2];
    }
    return dp[n];
}